One thing is nuance and truth. There's a lot of people capable of intellectual honesty who can argue about a topic with healthy levels of nuance if they are in the right state of mind, if they have time, peace and motivation to do it. This could be collected in magazines and other publications... well, at least if this kind of nuance and truth could be consistently valuable to a broad public. But it's not just that it's hard to tell apart this kind of content, but rather that we learn at very different rates, derive value from very different ideas, and the rest can quickly and easily become "noise" for us, while it's not for others. Some authors are original enough to combine new ideas with nuance and intellectual honesty, and those cases might be very interesting, but you can't really expect that in high and sustained doses. SSC was interesting in this sense, plenty of books are interesting in this sense, but they are mostly individual voices.
Another completely different thing is trying to build communities around those values. And even then, one thing is the real world, educating children to be rational, intellectually honest, critical... another thing is creating small physical communities with that kind of people, and yet another is creating "large scale", open, highly visible spaces that still have consistently high quality contributions. This last case seems unlikely to me. You either require large scale moderation, with all the potential problems that that involves (logistically, morally, and for the scope of the discussions [I still think it tends to be better than no moderation. Small communities are naturally moderated by the fact that no one interested enough in a topic will get to find the community]), or you need everyone to be intellectuals with similar priorities and a strict discipline to shut up unless you are in the best conditions to contribute (have something useful to contribute and they are in an emotionally stable state when they can best fight against their own biases and whatever). Both seem pretty impossible.
Other approaches are possible, though, and have been used in many cases in similar and different contexts. Basically, entry doors to large communities that interact in smaller subgroups. Take forums and threads, reddit, google itself where you can search whatever you want but end up in a random blog, etc. The main issue is structuring information and interests in an accessible way / discoverability, standardizing the interaction methods... but there will still be a lot of noise. You could try with other ideas like allowing authors or discussion starters to filter by themselves the answers, and have both filtered and unfiltered discussions, so readers can access to "highly curated" discussions on the topics they enjoy, while also being able to switch to the mess that real interaction inevitably can become (and with it, the broader perspective, which can only ever be fuzzy and noisy).
Another completely different thing is trying to build communities around those values. And even then, one thing is the real world, educating children to be rational, intellectually honest, critical... another thing is creating small physical communities with that kind of people, and yet another is creating "large scale", open, highly visible spaces that still have consistently high quality contributions. This last case seems unlikely to me. You either require large scale moderation, with all the potential problems that that involves (logistically, morally, and for the scope of the discussions [I still think it tends to be better than no moderation. Small communities are naturally moderated by the fact that no one interested enough in a topic will get to find the community]), or you need everyone to be intellectuals with similar priorities and a strict discipline to shut up unless you are in the best conditions to contribute (have something useful to contribute and they are in an emotionally stable state when they can best fight against their own biases and whatever). Both seem pretty impossible.
Other approaches are possible, though, and have been used in many cases in similar and different contexts. Basically, entry doors to large communities that interact in smaller subgroups. Take forums and threads, reddit, google itself where you can search whatever you want but end up in a random blog, etc. The main issue is structuring information and interests in an accessible way / discoverability, standardizing the interaction methods... but there will still be a lot of noise. You could try with other ideas like allowing authors or discussion starters to filter by themselves the answers, and have both filtered and unfiltered discussions, so readers can access to "highly curated" discussions on the topics they enjoy, while also being able to switch to the mess that real interaction inevitably can become (and with it, the broader perspective, which can only ever be fuzzy and noisy).